Has anybody ever considered two phase fire relief from large atmospheric storage tank? On a project, it is assumed 90% liquid full in storage tanks for fire case.

From an internal document I have, it says if the tank is padded on the bottom and its diameter is greater than 15 ft, then when the liquid (not bubbly-foamy type) level is less than 95%, then two phase relief can be ignored.

Personally, I don't have experience with two phase relief from an atmospheric storage tank. Anybody can give some advice on this?

Has anybody ever considered two phase fire relief from large atmospheric storage tank? On a project, it is assumed 90% liquid full in storage tanks for fire case.

From an internal document I have, it says if the tank is padded on the bottom and its diameter is greater than 15 ft, then when the liquid (not bubbly-foamy type) level is less than 95%, then two phase relief can be ignored.

Personally, I don't have experience with two phase relief from an atmospheric storage tank. Anybody can give some advice on this?

Leo,

Because there is no situation based on which an atmospheric storage tank could be liquid filled especially in fire case; then two phase relief isn't applicable to such tanks...